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06-28-2019, 04:48 PM | #1 |
Member
Join Date: Jun 2010
Posts: 35
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Tail light help
I have 56 pickup and I am having trouble with one of the tail lights. The rear driver's side turn signal doesn't work at all. It works fine for the 3 other lights. Also, when the regular lights are on, both filaments in the bulb light up. I've traced through the wiring harness and everything seems to be okay. Electrical stuff is not my strong suit. Any ideas? Thanks.
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06-28-2019, 05:11 PM | #2 |
Junior Member
Join Date: Jun 2019
Posts: 17
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Re: Tail light help
Hi there,
Since it affects just the one unit, most likely Ground. "Turn" filament has none, but when the taillight is on, current feeds back to the "turn" filament. Mel |
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06-28-2019, 05:30 PM | #3 |
Senior Member
Join Date: May 2010
Location: Star, MS
Posts: 4,024
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Re: Tail light help
just a thought: Remove the bulb and check voltage on each of the contacts in the socket with the parking lights on. If you have voltage on both contacts you have either a bad signal switch or the brake/signal wire is shorted to the tail light wire somewhere. If you have voltage only on the tail light contact you might have a socket issue where the bulb is bridging the hot contact and making both elements burn.
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06-28-2019, 05:46 PM | #4 |
Senior Member
Join Date: Aug 2012
Location: Abq, NM
Posts: 3,607
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Re: Tail light help
The dual contacts in the socket may be slightly out of position or the bulb could be?
And double check that the fixture is grounded. |
06-28-2019, 09:48 PM | #5 |
Senior Member
Join Date: May 2010
Location: Midland Park, NJ
Posts: 3,981
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Re: Tail light help
Run a temporary ground from the taillight housing (where there is no paint) to the frame or other part where there is no paint. Ten to 1 it's a ground problem.
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06-29-2019, 09:49 AM | #6 |
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Re: Tail light help
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06-29-2019, 10:32 AM | #7 |
Senior Member
Join Date: Jun 2010
Location: San Antonio, Texas
Posts: 16,426
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Re: Tail light help
The brake light function is affected by the turn signal switch so that the high CP (brite) filament can work for both depending on how it is switched. The switch, the wiring, and the bulb are all suspect until you eliminate each possibility. The signal stat is in there too but if it works on one side then it should work for the other.
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